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package org.apache.velocity.example;
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
import org.apache.velocity.VelocityContext;
import org.apache.velocity.app.Velocity;
import org.apache.velocity.exception.MethodInvocationException;
import org.apache.velocity.exception.ParseErrorException;
import java.io.StringWriter;
/**
* This class is a simple demonstration of how the Velocity Template Engine
* can be used in a standalone application using the Velocity utility class.
*
* It demonstrates two of the 'helper' methods found in the org.apache.velocity.util.Velocity
* class, mergeTemplate() and evaluate().
*
*
* @author <a href="mailto:geirm@optonline.net">Geir Magnusson Jr.</a>
* @version $Id$
*/
public class Example2
{
public static void main( String args[] )
{
/* first, we init the runtime engine. Defaults are fine. */
try
{
Velocity.init();
}
catch(Exception e)
{
System.out.println("Problem initializing Velocity : " + e );
return;
}
/* lets make a Context and put data into it */
VelocityContext context = new VelocityContext();
context.put("name", "Velocity");
context.put("project", "Engine");
/* lets render a template */
StringWriter w = new StringWriter();
try
{
Velocity.mergeTemplate("example2.vm", "ISO-8859-1", context, w );
}
catch (Exception e )
{
System.out.println("Problem merging template : " + e );
}
System.out.println(" template : " + w );
/*
* lets dynamically 'create' our template
* and use the evaluate() method to render it
*/
String s = "We are using $project $name to render this.";
w = new StringWriter();
try
{
Velocity.evaluate( context, w, "mystring", s );
}
catch( ParseErrorException pee )
{
/*
* thrown if something is wrong with the
* syntax of our template string
*/
System.out.println("ParseErrorException : " + pee );
}
catch( MethodInvocationException mee )
{
/*
* thrown if a method of a reference
* called by the template
* throws an exception. That won't happen here
* as we aren't calling any methods in this
* example, but we have to catch them anyway
*/
System.out.println("MethodInvocationException : " + mee );
}
catch( Exception e )
{
System.out.println("Exception : " + e );
}
System.out.println(" string : " + w );
}
}
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